<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0 ,shrink-to-fit=no" >
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.1.0/css/bootstrap.min.css">
<title>container</title>
</head>
<body>
    <div class="container">
        <h1 >第一次</h1>
        <p>第一次</p>


    </div>
    <div class="container-fluid">
        <h1>第二次

        </h1>
        <p>第二次</p>
    </div>


    
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/popper.js/1.12.5/umd/popper.min.js"></script>
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</body>
</html>